Mercedes CLS 320cdi smoking black

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savi4s21

New Member
Joined
Jun 15, 2020
Messages
16
Location
Cambridge
Car
CLS 320cdi
Hello. I have cls 320cdi no dpf. Car runs fine but on heavy acerelation blows loads of black smoke .. same when car is parked and rev up 2.5k quick it blows black smoke ... No faults on diagnostic.. boost pipes is ok.. where could be problem ?
 
Hi Savi. What year is the car , what mileage on the engine. What normal style of driving do you do , around town ? Short trips ? Motorway ? Does it always smoke when revved hard or has that just begun happening. A bit more detail will help . :thumb:
 
Hi usually short trips ... Year is 2009 ... Im not sure how long car been doing it..i recently purchased and just noticed now 😤
 
Hi Savi. What year is the car , what mileage on the engine. What normal style of driving do you do , around town ? Short trips ? Motorway ? Does it always smoke when revved hard or has that just begun happening. A bit more detail will help . :thumb:
134000k on clock 2009 reg
 
Black smoke is un-burnt fuel - have you checked the air filters, its a diesel so they suck enormous amounts of air and is the cheapest first fix.
 
Air filter looks good
 

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